Potentials of forage legumes in farming systems of sub-Saharan Africa

abonos fosfatados agua del suelo australia azote caribbean caribe caupi cereales cereals cowpeas cropping systems cultivo intercalado culture intercalaire democratic republic of the congo eau du sol farming systems feed legumes fixation de l'azote gambia gambie gliricidia sepium intercropping leguminosas forrajeras leucaena leucocephala ley farming malawi mali mixed farming nigeria nitrogen nitrogen fixation pastizales pastures phosphate fertilizers production de semences seed production siria sistemas de cultivo soil water sudan syria syrie tanzania zambia zimbabwe